Glossary

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cosine rule

Subject: 

  • Mathematics

is a trigonometric rule used to calculate the length of a side or the size of an angle in a non right-angled triangle. The rule states that the square of any side equals the sum of the squares of the other two sides less twice the product of the other two sides and the cosine ratio of the angle between those two sides.

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Exam practice is essential. Make sure your student has access to practice exam papers for the subjects they take. Make sure the exam papers relate to the correct version of the curriculum.

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Studying should be active. Your child should be making notes, working through examples, doing practice exam papers and testing herself on the sections she is studying.

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Formulae sheets or key concept sheets are useful for quick revision. Get your teenager to stick them on the wall in their room. The more they look at the formulae and key concepts, the more likely...

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Different study methods work for different students. Find out what works for your child so you understand how you can support him or her.

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